ขายเครื่องเล่นเทป NAKAMICHI 660ZX สวยเสียงดี พร้อมใช้ เข็ม VU. หายาก Made in Japan
ขายเครื่องเล่นเทป NAKAMICHI 660ZX สวยเสียงดี พร้อมใช้ เข็ม VU. หายาก Made in Japan
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Nakamichi 660ZX
¥158,000 (circa 1980)
explanation
A cassette deck that omits the after-monitor function from the 670ZX.
It is equipped with an auto-azimu alignment function that automates the adjustment of the
azimuth. This allows you to adjust by simply setting the tape to be recorded and turning on the
calibration switch, and when the play button indicator finishes flashing, the adjustment is
complete.
In practice, when the calibration switch is turned on, the built-in 400Hz0dB test signal is
turned on and recorded. The instantly reproduced 400Hz sine wave signal is converted into
a square wave, and the progress (delay) between the left and right channels is detected by
a phase differential circuit. This phase shift causes the switching circuit to work and control the
output of the op-amp. The output of the op-amplifier = the plus or minus voltage applied to the
motor terminals changes depending on whether the right channel is advanced or lagged relative
to the left channel, and the direction of rotation of the motor changes. This moves the lever
connected to the reduction gear and adjusts the angle of inclination of the recording head.
The 670ZX is calibrated by displaying the playback level with a peak meter.
The mechanism adopts a frequency distributed double capstan system.
In this system, the double capstan method, which holds the tape firmly with two pinch rollers
and a capstan reduces modulation noise and suppresses various disturbances.
Furthermore, focusing on the flutter components caused by the correlation between the
capstan and the tape, we have achieved improved characteristics by changing the diameter
of the two capstan to avoid overlapping flutter peaks.
In the single-capstan method, the contact between the tape and the head is secured by
the crimping force of the head pad attached to the cassette tape, but in the double-capstan
method, a constant tape tension is always applied between the two capstans, so there is no
need for a head pad. For this reason, a pad lifter is installed, and the head pad is eliminated
to reduce the change in characteristics.
The chassis adopts a resonant braking type chassis, and the use of aluminum alloy with high
vibration damping properties and resin molded parts are combined to absorb micro-vibrations
and reduce the occurrence of resonance.
The control mechanism adopts C-MOS logic control, and the control cam linked to the motor
drives the mechanism such as the head base and pinch roller, and simultaneously operates
the muting circuit. Unlike the plunger method, it can operate quietly and smoothly with little
machine noise.
In addition, this mechanism-driven method allows for operations other than normal tape
control with six control buttons. From the FF/Rew state, pressing the Pause button will queue you,
pressing it again will result in RAMM (automatic heading), and pressing the Rec button while
recording will mute Rec while pressing. These operations are also possible with a remote control
unit sold separately.
The head part adopts a discrete three-head system with a completely independent recording
head, playback head, and erase head.
The P-8L type head is used as the playback head.
This head is a 0.6 micron narrow gap playback head by Crystalloy, which enables flat playback
up to ultra-high frequencies. In addition, by adopting a unique head shape and structure,
it expels low-frequency swells called contour effects, and achieves ultra-low frequency
reproduction of 10Hz.
In addition, it has excellent wear resistance and does not deteriorate even after 10,000 hours
of use.
The recording head uses an R-8L type head.
This is a 3.5 micron gap head made of crystalloy, which allows the core to be unsaturated
even when using metal tapes that require a lot of bias current, resulting in sharp critical zones
and low distortion recording.
The erasing head uses an E-8L type head.
It is a direct-flux double-gap type, which overcomes the poor low-frequency erasure ability
during recording and the signal erasing effect caused by spontaneous magnetization during
playback from the material and structure aspects.
In the recording amplifier section, the coupling capacitor connected to the recording head is
removed and directly connected to DC. This improves distortion during recording and
prevents low-frequency phase circumference.
It uses a double NF circuit that applies negative feedback to the capacitors of the recording
equalizer and playback equalizer circuits, reducing the distortion generated by the capacitor
and increasing DC stability at the same time.
By improving linearity and increasing the clipping level, we have taken care to ensure faithful
recording from small to large inputs.
It is equipped with a pointer-type level indicator.
The level meter displays peak levels over a wide range, from a noise level of -40 dB to a
saturation level of +7 dB.
It is equipped with RAMM (Random Access Music Memory) as an automatic heading function.
You can fast forward and rewind any number of songs up to 9 songs, and start playing and
playing. Also, if you count too much due to a misreading, you can count down by pressing the
Rec button.
It is equipped with a manual cueing function, and if you press the pause/cue button during
FF/Rew, the speed will be reduced by about 1/3 and you can listen to the recording. Then,
if you hold down the FF/Rew button, the speed will drop even more, which is about 1/5 of the
speed.
It is equipped with a one-touch Rec-Mute function, and when you press the record button
during recording, the input signal is cut only in between, resulting in signal-free recording.
It is equipped with Dolby level calibration and can be performed in one action with a built-in
400Hz 0dB test tone and a three-head configuration.
It is equipped with a timer recording and playback mechanism, and can be used for home
recording and alarm playback by combining an audio timer.
It is equipped with a rack-mount adapter and has an EIA-compliant rack size with a 19" panel
width and a 2 1/4" mounting screw pitch. Moreover, it is removable.
It is equipped with a 3-position tape selector and is compatible with EX (normal), SX (chrome),
and ZX (metal tape). The equalizer 120μs/70μs can be switched independently.
It is equipped with a Dolby NR system as a noise reduction system.
It is equipped with a high-power headphone jack.
Pitch ConteIt is equipped with a roll function that can change the playback speed by about
±6%.
It is equipped with a high-speed shut-off function.
It is equipped with a tape start memory function.
It is equipped with an MPX filter.
It is equipped with a power terminal (up to 125mA) dedicated to the Black Box series, allowing
the tape deck, amplifier peripherals, and the Black Box series to be used without a dedicated
power supply.
It is compatible with the RM-200 remote control unit, which is sold separately.
Mechanism Department Auto azimu alignment basic circuit T Auto azimu alignment
mechanism Discrete 3-Head T Image of each head
Model rating
Model Cassette deck
Truck Model 4-track, 2-channel, stereo system
Tape Speed 1-7/8ips(4.8cm/s)
Wow flutter Wrms
0.04% or less Wpeak
Frequency response 10Hz~22kHz ±3dB (ZX tape)
10Hz~20kHz ±3dB (SX, EXII tape)
Total signal-to-noise ratio (400Hz, ZX tape) 60dB or more (0dB, WTD rms) 66dB
or more (3% THD, WTDrms, Dolby NRin, 70μs)
Overall Strain Rate (400Hz, 0dB) 0.8% or less (ZX tape) 1.0
% or less (SX/EXII tape)
Erasure Rate 60dB or higher (saturation level, 1kHz, ZX tape)
Channel Separation 37dB or higher (1kHz, 0dB)
crosstalk 60dB or higher (1kHz, 0dB)
Bias frequency 105kHz
input 50mV/50kΩ
Output (400Hz, 0dB, output level max) Line:1V/2.2kΩ
Headphone:45mW/8Ω
DC output ± 10V, 125mW max (Black Box Series Only)
power 100V、50/60Hz
Power consumption 27W Max
Dimensions Width 482 x Height 143 x Depth 340mm
weight Approx. 9kg
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